I am a realtor and I use drop box to share video files of houses to my out of town clients.
I started running low on hard drive space on my Mac. I realized I had lots of videos in dropbox but also on my local hard drive. So I selected a bunch of file (about 685 GB) that I wanted to move to online only. However, it's giving my warnings that it doesn't have HD space to perform this and is estimating between 30 and 100 days to complete the sync. I can only pause the sync. I think if I could cancel it, I could select a smaller set of files and get the HD space freed up.